ezzzzzzz Posted December 5, 2007 Author Share Posted December 5, 2007 Yes, the outer adapter is eliminated. The companion flange is drilled to suit the halfshaft application. The flange is extended 19mm so it matches the 19mm offset of the Z31 front hubs. This allows using a set of wheels/tires of the same size for rotation. I prefer running the same width wheel/tire all around. The added 19mm will not have any measurable affect on axle strength. The manufacturer indicated no problem doing this. They produce massive numbers of axles for the major car companies too. The axle could just as easily be machined to the stock offset but same larger spline diameter, if desired. Spacers are eliminated. The flange is 5.9" diameter and round. It can be drilled to whatever bolt pattern the end user wants. I chose the 5 x 4.5" because it opens up the option of wheels available and the 19mm positive offset is very popular. Quote Link to comment Share on other sites More sharing options...
blueovalz Posted December 5, 2007 Share Posted December 5, 2007 Sounds good. Some day I may actually be able to remove the 3/4" spacers I have on the wheels now. What size nut are you looking at to bind all of this together. I've seen several failures on the nut side of the splines (too much tightening torque?), so will this be a larger diameter thread as well? Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted December 6, 2007 Author Share Posted December 6, 2007 Not now. I'm threading to use the standard 280ZX lock nut. I've never seen a failure although my exposure to such things is limited. It would take a crap load of torque to cause the axle to fail there. In my mind, applying factory recommended torque would suffice holding things together and eliminate fractures. The nut could only go so much bigger considering the constraints of the hub dimensions. Quote Link to comment Share on other sites More sharing options...
MONZTER Posted December 7, 2007 Share Posted December 7, 2007 Hey Guys, Don't know if this helps or not, but here is what I did to increase the offset and strength of the rear of my 240. I got some rear control arms from a 85 300zx turbo, stubs and companion flanges. The bearing hub on this arm is welded on to the control arm. I cut the bearing hub off and cleaned up the left over welds making the OD of the hub concentric with the ID. So now I have a perfect set of bearing hubs. Next I took my 240 strut and removed the strut tube from it leaving only the casting (so it will fit in my lathe). I chucked this up in the lath and cleaned the ID of the casting. The ID of the casting is now exactly the correct size of the OD for the 300ZX hub. I then pressed fit the hub into the 240 strut casting and then welded around it with 309 stainless. So now the 240 strut uses 300zx turbo stub axle, bearings, companion flanges, CV axles and my offset is +20 mm to work perfectly with 40 offset wheels and no spacers. I hope this make sense? Here are some pictures, and some numbers. Click on the pictures to go to my gallery for more more and bigger views. Jeff Quote Link to comment Share on other sites More sharing options...
blueovalz Posted December 7, 2007 Share Posted December 7, 2007 Nice thinking and fabrication. I especially like the upright/rear mount frame. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted December 7, 2007 Author Share Posted December 7, 2007 That is some nice work there. You've covered a lot of bases in your suspension modifications. You've gone far beyond simply adding 5 bolts and positive offset. My attempts are to create a viable and simple alternative to the major fabrication you've undertaken. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted December 8, 2007 Author Share Posted December 8, 2007 The axles arrived. Tell me what you think. I picked up the round stock for the companion flanges. Off to the machine shop in a couple of days. Quote Link to comment Share on other sites More sharing options...
blueovalz Posted December 8, 2007 Share Posted December 8, 2007 They look great Mark! I'm liking this! Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted December 8, 2007 Share Posted December 8, 2007 I down for a pair!!! Quote Link to comment Share on other sites More sharing options...
wickiewicked240z Posted December 8, 2007 Share Posted December 8, 2007 i like this also but with a 5x4.75 bolt pattern with flanges for z31 turboCV's Quote Link to comment Share on other sites More sharing options...
JIM73240Z Posted December 8, 2007 Share Posted December 8, 2007 me like. i want some one with a big motor to beat the crap out of those. jimbo Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted December 8, 2007 Author Share Posted December 8, 2007 I'm glad to see the response. Now for a reality check. The machinist screwed up. It's easily resolved but does present a minor setback. I provided drawings and a stock axle. I requested the identical axle dimensions (as far as bearing spacing,etc.) but with the flange pushed 3/4" more outboard. What he did was machine a stock axle with a 3/4" thicker bearing stop. The axle is 3/4" too short now. After I got over the frustration I had to laugh. At least I'm heading the right direction. Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted December 8, 2007 Share Posted December 8, 2007 Not now. I'm threading to use the standard 280ZX lock nut. I've never seen a failure although my exposure to such things is limited. It would take a crap load of torque to cause the axle to fail there. In my mind, applying factory recommended torque would suffice holding things together and eliminate fractures. The nut could only go so much bigger considering the constraints of the hub dimensions. Unfortunately I thought that is where they primarily fail. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted December 8, 2007 Author Share Posted December 8, 2007 Well, I have considered this. I persomally feel this failure point is directly related to overtorquing the lock nut. The only force applied here is the clamping force. Even in a high speed turn the side loads imposed should be lower than that required to snap the axle here. Since I need to have the axles machined again I will look into a larger nut too. Any suggestions here? Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted December 8, 2007 Share Posted December 8, 2007 They do look great. I'd be interested in a set depending on the price!! It sure would be nice for wheel selection for drag racing!!! Justin Quote Link to comment Share on other sites More sharing options...
Zfan1 Posted December 9, 2007 Share Posted December 9, 2007 I would be interested as well. I have broken 3 280z stub axles as of late and thats on motor, If I hit the bottle they snap instantly...talk about scary. Quote Link to comment Share on other sites More sharing options...
zcarnut Posted December 9, 2007 Share Posted December 9, 2007 ...Since I need to have the axles machined again I will look into a larger nut too. Any suggestions here? Mark, I recall from measurement that the Z31 lock nut is slightly larger in diameter (both internal and external). Just make sure it will fit in whatever companion flange you are going to use. Quote Link to comment Share on other sites More sharing options...
zcarnut Posted December 12, 2007 Share Posted December 12, 2007 Can someone mic a Z31 stub axle for me. I need to know the diameter of the threaded portion for the nut. Thanks ahead of time. It's 22mm with a 1.50mm thread. The S30/S130 stub axle thread has a diameter of 20mm. 24mm x 1.5mm is also a common size for spindle nuts: http://www.rockfordcv.com/PDF%20Downloads/Spindle_Nuts.PDF Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted December 17, 2007 Author Share Posted December 17, 2007 I'm finalizing a new drawing for the 19mm offset stub axle. Having looked at larger nuts I'm leaning towards the 22mm 1.5 size. The reason is twofold. One, a 2mm diameter jump is actually quite substantial. It also allows companion flanges to be machined for those using the early 4 bolt U-joint halfshaft as well as larger flange bolt patterns. This should help reduce the number of different stub axles and companion flanges needed to cover a wide array of applications. Secondly, I think the failure at the thread/spline area is caused by over-torquing and/or stretch when the splines start to deform (twist). The larger spline area should eliminate the second issue entirely. Quote Link to comment Share on other sites More sharing options...
blueovalz Posted December 17, 2007 Share Posted December 17, 2007 I like this process of improving a really good idea into a great application. And knowing what I've seen you do, it should be a very nice piece when finished. Quote Link to comment Share on other sites More sharing options...
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